• 대한전자공학회논문지TC
• /
• 제38권11호
• /
• pp.49-54
• /
• 2001

GaAs pHEMT와 도파관-마이크로스트립 변환구조를 이용하여 고출력, 고이득 특성을 갖는 Ka-band 하이브리드 전력증폭기 모듈을 개발하였다. 본 전력증폭기는 10 mil 두께의 duroid 기판을 이용한 마이크로스트립 라인과 도파관 마이크로스트립 변환구조로 이루어져 있다. 제작된 도파관-마이크로스트립 변환구조는 32 40 GHz 대역까지 약 1 dB의 삽입손실(back to back)을 보인다. 전력증폭기 모듈의 측정 결과, 36.1 - 37.1 GHz에서 1W 이상의 출력 전력, 23dB 이상의 전력 이득을 보이며 36.5GHz에서 31dBm의 출력전력, 24dB의 전력 이득, 15%의 PAE을 나타내었다.

• Journal of information and communication convergence engineering
• /
• 제5권4호
• /
• pp.358-361
• /
• 2007

We report on a new type dc-dc converter design that combines the advantage of dc ripple noise elimination and high efficiency. As potential low cost solar cells, DSC module and the panel's system efficiency and stability are still critical problems to the way of marketing. In this study, a new three-step dc-dc converter scheme with the phase-shift-carrier technology is proposed to apply for solar power system. We have achieved power conversion efficiency around 94.88%.

• Current Photovoltaic Research
• /
• 제7권3호
• /
• pp.71-75
• /
• 2019

Solar energy is one of the renewable energy sources. It can respond to expanding energy demand. A solar cell module is designed to have a durability that can be developed over a long period of 25 years to be installed outdoors and perform like a stable power supply. We need Standard Test Condition (STC)-based power output data before and after testing to measure the power output of existing modules. The modules are shown to reduce power output by comparing data before and after outdoor experiments regardless of whether they are indoor or outdoor. It is easy to compare the power output quantities through the module simulator in the indoor. However, it takes a lot of testing time and costs to compare the power output on outdoor in the case of a high number of modules and distance from the module simulator. It can save time and costs if we can check the power output using the data in outdoor. We have used the long-term outdoor test to find the elements out that corresponds to the reductions in power output quantities. We have conducted research that matched the actual and the tests.

• 한국태양에너지학회 논문집
• /
• 제26권4호
• /
• pp.47-54
• /
• 2006

The current power generation is very suitable renewable energy for the application to Korean western and south coastal regions where characterized as having high current speed. Being different from tidal power generation that needs tremendous dam structure to preserve water, the current power generation utilizes the ocean current flow without damaging to estuary area and its environment. There are still many areas to understand the characteristics of current power generation for the actual field installation. As designing muti module with several rotors, the interaction between rotors will occur that would affect the efficiency and RPM of each rotor. In this study, the interactions caused by gaps between rotors in multi module are studied.

• 전력전자학회논문지
• /
• 제17권5호
• /
• pp.393-400
• /
• 2012

The modularized equalizers normally use additional components among the modules in the long series-connected lithium-ion battery string. In these approaches, the overall systems are heavy, bulky, and high-priced. Furthermore, the losses related to additional components decrease the system efficiency. To avoid these problems, a modularized equalizer, which has no additional components among the modules, is required. This paper proposes a novel control scheme using the magnetizing energy of the multi-winding transformer for the module equalization. In this scheme, the high duty cycle is applied to the module where the voltage is higher than the reference voltage and the low duty cycle is applied to the module where the voltage is lower than the reference voltage. Due to the different duty cycle, more electric charges are transferred from high voltage module to the low voltage module during the turn-off switching interval. Using the proposed control scheme, the equalizer system does not suffer from the size, cost, and loss related to the modularization. The experimental results are provided to verify the effectiveness of the proposed modularized equalizer.

• 한국전자통신학회논문지
• /
• 제13권5호
• /
• pp.943-948
• /
• 2018

본 논문에서는 GaN MMIC를 활용하여 X-band 레이더용 SSPA모듈을 설계 및 제작하였다. SSPA의 구동 증폭기 단은 Gain Loss를 감안하여 GaN MMIC를 2단으로 구성하였다. 그리고 고출력 SSPA 모듈 구성을 위해 전력증폭단을 4단으로 설계함에 따라 전력분배기와 전력합성기는 4way 방식으로 설계하였다. 제작된 전력 분배기는 -3.0dB 이상의 손실을 나타내었으며, 전력합성기는 -0.2dB의 입출력 손실과 각 포트 간 위상차는 평균 $2^{\circ}$로 양호한 특성을 보이고 있다. 제작한 SSPA모듈 실험 측정 결과 9~10GHz 주파수 대역에서의 Gain은 48.0dB 이상인 것을 확인하였으며, P(sat)=88.3W (49.46dBm) 이상, PAE=30.3% 이상임을 확인하였다. 본 논문에서 제작된 X-Band SSPA 모듈 성능 확인과 전력분배기/합성기 개선을 통해 향후 SSPA모듈에 대한 RF성능 개선에 많이 활용될 수 있을 것이다.

• 제어로봇시스템학회논문지
• /
• 제15권12호
• /
• pp.1197-1202
• /
• 2009

We present a power-efficient driving scheme that consists of piezoelectric actuator and driver IC for AF (Auto-Focus) on ISM (Image Sensor Module). The piezoelectric actuator is more power-efficient than conventional voice coil motor actuator. And high power-efficiency driver IC is designed. So the proposed driving scheme using designed piezoelectric actuator and driver IC is more close to recent trend of green IT. The diver IC should guarantee fast and accurate performance. So, the optimum driving method and high accurate frequency synthesizer are proposed. The die area of designed driver IC is $2.0{\times}1.6mm^2$ and power consumption is 2.8mW.

• 마이크로전자및패키징학회지
• /
• 제24권1호
• /
• pp.17-25
• /
• 2017

Recently, research and application for a power module have been actively studied according to the increasing demand for the production of vehicles, smartphones and semiconductor devices. The power modules based on the transient liquid phase (TLP) technology for bonding of power semiconductor devices have been introduced in this paper. The TLP bonding has been widely used in semiconductor packaging industry due to inhibiting conventional Pb-base solder by the regulation of end of life vehicle (ELV) and restriction of hazardous substances (RoHS). In TLP bonding, the melting temperature of a joint layer becomes higher than bonding temperature and it is cost-effective technology than conventional Ag sintering process. In this paper, a variety of TLP bonding technologies and their characteristics for bonding of power module have been described.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2008년도 제39회 하계학술대회
• /
• pp.1345-1347
• /
• 2008

This paper described a method of determining whether arcing is present in a low-voltage wiring system. We simulated the series arcing that generated in electrical loads and fabricated a arc detection module which can discriminate between normal and arcing state. The module consists of a high-pass filter with a low cut-off frequency of 3 kHz to attenuate power frequency voltage and an active band-pass filter with a frequency of 4 kHz ${\sim}$ 8 kHz to detect series arc signals only. We tested an Incandescent lamp that was controlled by a dimmer and analysed. The module consists of a high-pass filter with a low cut-off frequency of 3 kHz to attenuate power frequency voltage by 80 dB and an active band-pass filter with a frequency of 4 kHz to detect series arc signals only. From the experimental results, we could detect series arc signals without an influence of non-linear loads.

• 반도체디스플레이기술학회지
• /
• 제20권3호
• /
• pp.161-166
• /
• 2021

To prevent accidents caused by changes in the surrounding environment or other factors, various protection facilities are installed at the photovoltaic connection module. The main causes of fire are sparks due to foreign substances inside the photovoltaic connection module through high temperature rise and dew condensation in the photovoltaic connection module, and fire due to heat from the power diode. The proposed method can predict the fire by measuring flame, carbon dioxide, carbon monoxide, temperature, humidity, input voltage, and current on the photovoltaic connection module, and when the fire conditions are reached, fire alarm and power off can be sent to managers and users in real time to prevent fire in advance.